phthalic anhydride(redirected from Gibbs phthalic anhydride process)
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A white crystalline compound, C8H4C3, the anhydride of phthalic acid, used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides.
(Elements & Compounds) a white crystalline substance used mainly in producing dyestuffs. Formula: C6H4(CO)2O
a white, crystalline, slightly water-soluble solid, C8H4O3, used chiefly in the manufacture of dyes, alkyd resins, and plasticizers.